Detachable-tooth saw.



` PATBNTBD 00T. 15, 1907.

A. KRIEGBR'. DETAUHABLE TOOTH SAW.

APPLIOATION'FILBD JURK 20. 1907.

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UNITED STATES PATENT OFFICE.

ANDREW KRIEGER, OF COLUMBUS, OHIO, ASSIGNO-R OF ONE-HALF TO AMBOS M.HARRIS, OF COLUMBUS, OHIO,

DETACHAB LIE-TOOTH SAW.

Specification of Letters Patent.

Patented et. 15, 1907.

Application tiled June 20, 1907. Serial No. 379,845.

To all whom it may concern:

Be it known that I, ANDREW KRIEGER, a citizen of the United States,residing at Columbus, in the county of Franklin and State of Ohio, haveinvented a certain new and useful Improvement in Detachable-Tooth Saws,of which the following is a specification.

-The invention relates particularly to the class of inserted tooth sawsin which the teeth-retaining parts 1are removably secured in recessesprovided in the sawblade.

I-Ieretofore much diiiiculty has been experienced in providing means forproperly securing the teeth without straining the saw-blade and causingbuckling thereof or expansion and distortion of the edge of the blade.

In my prior patent No. 544,438, issued August 13, 1895, I have shown anddescribed a device designed primarily to overcome the difficultyreferred t0, and the object of the present invention is to provide animprovement on the device shown in that patent.

rl`he improvement resides mainly in the construction of the bridge-pieceor tooth-containing member that directly engages and is bound to thesaw-blade, said member having a greater and more evenly distributedflexibility than in the patented device referred to whereby `a widerrange of variation in the size of the shanks of saw-teeth is providedfor. Furthermore, the improved construction provides a larger bindingsurface between said flexible member and the seat on the saw-blade.

An embodiment of the invention is shown in the accompanying drawings butthe invention is not limited to the precise details of constructionshown.

In said drawings-Figure l is a perspective view of a section of asaw-blade with bridge-pieces, teeth, and clamps in assembled positionfor operation. Fig. 2is a side elevation showing bridge-piece, tooth,and clamp with the tooth and clamp in partially inserted position of thetooth, and Fig. 3 is a perspective view of the bridge alone.

In the several views l designates a section of sawblade provided withsubstantially circular recesses cut thereinto to form seats 2 for thebridge-piece or teethcontaining members 3. The bridge-piece 3 is alsosubstantially circular in form and ot approximately uniform width butthe seat-engaging edge of the bridgepiece is formed on an arc ofslightly less radius than that of the seat 2 on the saw-blade so thatwhen not under tension of the clamp and tooth the br'idge-piece does notclosely fit the seat 2 throughout its length, but a narrow spacegradually increasing towards the free end of the bridge-piece is leftbetween said piece and the seat on the saw-blade to provide for flexingof the bridge-piece. At one side the bridge-piece is provided with ascarf or lap 4 to engage a corresponding scarf 5 on the saw-blade sothat the bridge-piece lies flush with the surface of the saw-blade.Perforations 6 are provided through the bridge-piece and blade toreceive rivets for binding the parts securely together at one side. Atits opposite or free end the bridge-piece is providedv with a recess 7to receive a tongue or projection 8 on the saw-blade whereby thebridge-piece is held at said end from lateral displacement. 9 designatesa clamping member circular in form on its outer edge to snugly engageand slide 0n the inner' edge of the bridge-piece 3. The clamping member9 is cut away at l() to form with the inner edge of the bridge-piece arecess to receive the shank 1l",of the cutting tooth ll. Thebridge-engaging edge of the clamping member and tooth are provided witha groove as usual to engage a corresponding tongue formed on the edge ofsaid bridge-piece. The clamp is perforated at 1lb, lll to receive asuitable wrench for sliding the clamp around on its seat to properlyposition the tooth and clamp the same in place. The clamp is alsoslitted at llc to provide for flexibility in that member.

In order that the teeth may be manufactured and sold cheaply they arenot made with great precision as to the size of shank, but the Shanksare made slightly thicker than the recess between the clamp andbridgepiece so that when the clamp and tooth are forced around on theirseat in setting the teeth there is a wedging action between the clampand bridge whereby the stress is transmitted to the free portion of thebridge and the same flexed until bound closely on its seat through agreater or less extent. It is thus seen that the construction providesfor a wide range of variation in the size of the shanks of teeth andfurthermore, because of the circular shape of the bridge-piece and itsuniform width, the flexing strain is distributed over a larger area thanhas heretofore been accomplished and a more extensive binding surface issecured. It will also be noted that the slot and tongue construction atthe free end of the bridge-piece tends to prevent the entry of saw-dustbetween the parts whereby they are caused t0 spread.

What I claim and desire to secure by Letters Patent 1. In an insertedtooth saw, the combination with the saw-blade provided with asubstantially circular' seat, of a flexible bridge-piece ofsubstantially circular form and of approximately uniform width, saidbridge-piece having its blade-engaging edge of slightly less radius thanthe seat on the blade, means for securingr the bridge-piece at one sideto said seat, a clamping member' to engage and slide o'n the inner edgeof said bridge-piece and provided with a seat for a saw-tooth, said seatadapted to coperate with the inner edge of the bridge-piece to clamp andwedge a tooth, whereby the free end of tlievbridge-pece is flexedtowards the seat in the blade when the clamp and tooth are moved t setposition of the tooth.

2. In an inserted tooth-saw, the combination with the saw-blade providedwith a recess forming a seat for a tooth-retaining bridge-piece, aexible bridge-piece secured at one side in said recess and normallyengaging a portion only o1 said seat, a tong\ieandgroove connection forthe bridge-piece and blade at the opposite side of said recess, and atooth-retaining clamp for coperation with said -bridgepiece to clamp andhold a tooth, said bridgepiece adapted to be pressed towards said seatunder pressure of the clamp.

3. In an inserted tooth saw, the combination with the saw-blade providedwith a recess forming a substantially circular seat for atooth-retinininar bridgepiece, :i sul)- stantially circular flexibleln'i(l.,-'epecc semn'ed nl one .side in said recess and normallyengaging' :1 portion only ol' said seat, u tooth-retainingl clump forcoperniion will said bridge-piece to clamp and hold :x 100111. the l'rw`1mi'- tion of said bridge-piece adapted 1o he pressed towards said sentunder pressure of the elnnlp.

ANDREW Klllllllt.

Witnesses ALICE B. Coon.

